In with .
So I submit my application around mid December and interviewed on the 22nd right before the Christmas time. The Adcom members were nice enough to hold the interview for me at that time. The Adcoms I interviewed with were extremely nice, and the interview was very relaxing (I truly enjoyed talking to them). The career discussion was fairly short (around 20mins), and the interview was around 40mins. For the interview, there were just basic questions such as why MBA, why now, why UIUC, etc. For the career discussion, we basically went over the career goals which I would like to achieve and some working background. I have to admit that was really nothing to prepare for....
As voyager mentioned, the UIUC is cutting down class size to 65ish for the coming year - More efficient use of resource (one session instead of two session because of the classroom size) and achieve a higher MBA ranking for the coming years. Also, the program is trying to focus on technology management side, so UIUC is probably not the best choice for you, if you want to concentrate on fields such as IB.
So, best luck to everyone.